From: "Namjae Jeon" <namjae.jeon@samsung.com>
To: "'Eric Sandeen'" <sandeen@sandeen.net>,
"'Hyunchul Lee'" <hyc.lee@gmail.com>
Cc: "'Namjae Jeon'" <linkinjeon@kernel.org>,
"'linux-fsdevel'" <linux-fsdevel@vger.kernel.org>,
"'Pavel Reichl'" <preichl@redhat.com>,
<chritophe.vu-brugier@seagate.com>
Subject: RE: problem with exfat on 4k logical sector devices
Date: Thu, 13 May 2021 15:53:19 +0900 [thread overview]
Message-ID: <003901d747c4$a8801f50$f9805df0$@samsung.com> (raw)
In-Reply-To: <39726442-efd9-2c7a-c52e-04b1d7f14985@sandeen.net>
> On 5/12/21 11:44 AM, Eric Sandeen wrote:
> > I also wonder about:
> >
> > bd->num_sectors = blk_dev_size / DEFAULT_SECTOR_SIZE;
> > bd->num_clusters = blk_dev_size / ui->cluster_size;
> >
> > is it really correct that this should always be in terms of 512-byte sectors?
>
> It does look like this causes problems as well:
>
> # dump/dump.exfat /root/test.img
> exfatprogs version : 1.1.1
> -------------- Dump Boot sector region --------------
> Volume Length(sectors): 65536 <<<<<<
> FAT Offset(sector offset): 256
> FAT Length(sectors): 64
> Cluster Heap Offset (sector offset): 512
> Cluster Count: 65024
> Root Cluster (cluster offset): 6
> Volume Serial: 0x1234
> Sector Size Bits: 12 <<<<<<<
> Sector per Cluster bits: 0
>
> ...
>
> # tune/tune.exfat -v /root/test.img
> exfatprogs version : 1.1.1
> [exfat_get_blk_dev_info: 202] Block device name : /root/test.img
> [exfat_get_blk_dev_info: 203] Block device offset : 0
> [exfat_get_blk_dev_info: 204] Block device size : 268435456
> [exfat_get_blk_dev_info: 205] Block sector size : 512 <<<<<<<
> [exfat_get_blk_dev_info: 206] Number of the sectors : 524288 <<<<<<<
> [exfat_get_blk_dev_info: 208] Number of the clusters : 65536
Understood, Will fix it.
Thanks for detailed explanation!
next prev parent reply other threads:[~2021-05-13 6:53 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 17:28 problem with exfat on 4k logical sector devices Eric Sandeen
2021-05-11 21:21 ` Namjae Jeon
2021-05-11 23:33 ` Eric Sandeen
2021-05-11 23:53 ` Namjae Jeon
2021-05-11 23:57 ` Eric Sandeen
2021-05-12 14:09 ` Hyunchul Lee
2021-05-12 16:44 ` Eric Sandeen
2021-05-12 17:56 ` Eric Sandeen
2021-05-13 6:53 ` Namjae Jeon [this message]
2021-05-13 6:52 ` Namjae Jeon
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